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Income Taxes - Summary of Domestic and Foreign Components of Loss Before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Domestic $ (77,354) $ (65,695) $ (54,568)
Foreign (18,065) (3,194) 0
Loss before income taxes $ (95,419) $ (68,889) $ (54,568)